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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68fca14225415aa4f909a4a8f1a4c9c03205f6f89a2f8a6cf971f93bf68fa19' 
  AND token = 'XP362aJagm0LBAs81Bgpr22+Y4/a1jXVtzs93pKDARI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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