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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112ff0c0b464204fc6909a89e7a2331c30c215ca8966f43cd9c00796815c6d3f' 
  AND token = 'duUddac7aWi2PSGOG3P9cp0iyOLnDy2anlgLaqDy3Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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