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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e0861e309fcccfb4bec4f597aaa3bd85c4250bfc124ae901bbaf019f0995c3' 
  AND token = '76p+/GZF9lRodOe8oeXoRRbK6YH7A2crt3CPg3b5U1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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