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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f32fc5b354a655bb8b4e81cdcb92d6f5233aa7054e15aa5b9cc90c2cfae1c0' 
  AND token = 'ewwoOzv8e5QjDU+zpgE3MCF1Lyi1ianrKMUibvL6KXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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