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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ab106805e31a73f573a4067f49f5b6fbf00ffc14f75f8e2f0962ff5a32b393' 
  AND token = 'Y2GeyKph8FBzMv5nbBZ7riHQCYDh1meZMkT7g853buA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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