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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ede710df4a7deb577c1c1fe4f81e0a3158883703be6657fd190c0dba225cdba' 
  AND token = 'id2Y3aOPwCiF/3PNCbyGxVfldGtJNv5X1p+13M4tRbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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