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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858e4410fea0efd6d90a1ac5ae69768866643bbf401620fdc572afcd8f44717d' 
  AND token = 'EjuL0WHwFeN3RlOALloWw+sxCi8oss6Hsvf2BfBSino=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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