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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25ff1866be944731446cb18224a9faf178b74e2bd1d777d434ba7be41458d89' 
  AND token = 'uSrLatdXWqfNwyF0v2AHpzx23DS7hOwNIDzJAyNs2wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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