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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd94c009fadebf09333aa91a0dfdc2c6805ca0374bbba6e5b578ae5404010bce' 
  AND token = 'HMrBXIvi3lbXlKD0s37QWIe1vy2X4Pv4sgyl+H+ex8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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