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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da8fe3680ea239de461e733cba9db44d862536bf1327acccbc0a27079f70ffb' 
  AND token = '899e0ktdJU43OjFQt+md/vkZ/MN4IRH8WmDuTDf+b+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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