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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baba2938a76d5ee410c1d1f2502bc77f8080cd8da00c40a930806d39f1e152ae' 
  AND token = 'A0J6i5G5cRXuYAQj3vXqYT/w0DEO5LNxmaRVVm6+E+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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