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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdabe6cfe221d0d9247b62d0eb19d4c3248d644d48e3fe9ff49d61c5ccc6ab3' 
  AND token = 'O6Uk8k+dUheEx9KfQebAMkz+wOAxqYgif9Az7fQdLq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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