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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb29af55f0d9f5edd81ef78e76f3ea2b922aa6012891df77901901ba1e3a2ebb' 
  AND token = '9RPUMCl18oetUKSttV67iWlS0iyoHGX7FpP6m+wzTr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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