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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130ec8db7bb1e2aa5951f0e4f3513772bfa61453c083bc351caecd7ddb41c584' 
  AND token = 'KoXY3hMrep1SEWSfl56ieEr5ay+oqRirbSEo+X74msQ=' 
  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"
    }
  }
}