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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c647e6298c14681e0c4b89f8d93acb0d987e66a24ebf078861b95957787ca5' 
  AND token = 'MYIe4C3NUM6mwChBoyvnaaLgysvQMCqHd7mpxLavFFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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