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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387e3d8905a26d2aed46065bc750f46fc3c2fe2401fdebb8d9b11590edc03434' 
  AND token = '3RnyA0igNF0yJ6EMiy5kQrGkKNE6VuoK12cXVhynpVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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