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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4744b00c7dfb8d828fbe7de95c6c5add7fef7de73a9f9106b61b09d697ebfe' 
  AND token = 'gxM8rxs/x9i7iz6mBWYPlkqD81PkPCICW/8csjn9Zg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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