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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80296447c0b34e53cb2c0c7144fe4571361246dbaaeed47087a310de672cbd1' 
  AND token = 'VVC1w4na0Ot9PcajvG7l1+CVNXsi3xXid0j73cdEjhY=' 
  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"
    }
  }
}