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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dc01c3e2ecfa714058a17b76155a25982e313bc84ab7dd502f34ae0fb4bbc4' 
  AND token = 'qhIv4Jf5Qu/UUM4IC/3cvm6vo5/wLCqZ1AmzVEGTMHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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