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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb36418dbec7c6c829fa69b5e0007e71215a2d77500e841a0b20da89568ce24' 
  AND token = '6/aFPGJ1d/5e8Uz6NkcK8n5dIc2YSWfa8l218iA0q2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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