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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cac6d653d79f3663e122347474a388ea63e07b65ae2bb8d2019e9dc8b4d3bb' 
  AND token = 'whoX5Z8PgLZtVuxRww4GYtRluIuGXDO4IQ3KinekZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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