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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72a64a13451af18f1fc036e5d93c64e297bdca0a8d5711e9f8e44841001bb78' 
  AND token = 'FFkCz4KMvIcQPiGJTRKE3Dalf9O7PXl7xET46GcQsXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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