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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d6f832bf2fd01563755945711e101dc7ac9ee258fd0ad8eb0a572072788a49' 
  AND token = '2NtnqlXvje17NyvUOfQsoyxtvLmr1yHu3ZWivjtRdik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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