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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09677c19fdf4a25d339f283768e65f1c636eb6c60a0d6a0c180813076d1c6d3e' 
  AND token = 'lm+3X+wTPbCFLoJ4CnE6MfkfcjehRWBa3W1Om80XNEQ=' 
  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"
    }
  }
}