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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1e896af1324d9a034b1a64b06b27ed73529784ce6bdb0e18d589fd31f6576' 
  AND token = 'qkXZ19CnFzxQRIgL0X1p9wa0IPNSubEQ3SVCUiiS3jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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