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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235cd202501d98e053d8d14fe15d8d5b3b58df569a76e9dad4744e278f24687c' 
  AND token = 'NPg0x6ce24SyQU1lV9B3cNc+bQ4LxCJvvAykqP1N5m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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