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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6caa2f0ba68d332c713af85a86f1db9cd3f4b4f6e55a3e42efd3aeb40d258f' 
  AND token = 'RALZM2ObDR6LGbf2LWhC6mnC0e/9gt5yqDj5klkbeU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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