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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2995f6d8ec9f04ed6bf984ad87d73e479c622aac90e3722723e8a0cceae34a10' 
  AND token = '61q5/dNMq/o3+S01DiOSxbIyGpgjJN22eOYQI01HklE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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