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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4cf33e67b85ddf4b9dbdfe1b9027d8b77abf92020d1eda39199b934e35d2e3' 
  AND token = 'DUjR9/EV1WoN5YqG6uvGMkex3+Yt9YOyGva1lL1e2FI=' 
  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"
    }
  }
}