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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47c66b06a561cc2674976e508d04e6f1dcc9e3fae754aa0624bf81d285cdfb3' 
  AND token = 'bbaE0zxXAZJXu0h3ZtwgS/HxeY/4eRl9mgV2CSXZIx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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