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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c424fb78b94b338e7516663905e3a5140e752e9b8b182f6e1d49e63b3710b29b' 
  AND token = '06cR+MZ3JAmD+BH2aUUQdq5splK5ytwKRcE2fG++ufc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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