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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2535b6c6e5e23e2fca7c2b6ff24fd07d9b5a1c1ff3077cf979c63eab46219087' 
  AND token = 'WoeA80RsvLDnotbt095+MiOMHwAjywXT3EEnGOHKtc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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