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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dcf6bc814527705fd796c2d9a4476a4e4b67e2202f94916152d1555d08aa86' 
  AND token = '+oKM7nwpvPxo1YxaC/QExDNrn+eLuti+lMXdavc01Ok=' 
  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"
    }
  }
}