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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef61dc728d9691cff01fa00bc977360b98fd9c68e18a4c982c29cb9680b8d921' 
  AND token = '96xz2WxTX2mAusoSerP635v+pLnwLCPUOs+9qgZKws8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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