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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7089602a9343e6f0ac792aa45f442fcac636aae06f20ac54a73e8831cf7b2fb' 
  AND token = 'wdcJyS5Tqj/AEEaSx7sjHP+fLF2cWfN6910/L77BkoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}