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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae38ede765a555f1805d4bb29a29d5dfbd308a8ccfd58c9fbfcaf6ba0cd44a2a' 
  AND token = '8Z6QSFIVX2hFui3bRly5JAx8REz6Q8fW6l/O9YotX0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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