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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa5a5aa5735f688d53909b05c9d4bbfa985b53ccdeae41e88fbf0d3925cb34e' 
  AND token = 'o9Q2RSmMUIg54k1p27xTUZBSoTJIkCRlw7ZBNpStKb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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