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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ff5785f00b5a831ed9949b85b554a20d29bbd0203f3cf9b283a3cc148866d6' 
  AND token = '9/xUw/2qdQKHttt9QAXsG97vD9nPmC2nfwM0PMJQKf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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