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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccfea1c6e6f84d757762e95c47fcb302c1e16726dd4e50fdc66f7e2a297de842' 
  AND token = '1p3Fb5ZE+rkMH9oysohdCclm3gjrQAMnPwVjP+NZHhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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