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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c326861c4a1fa72e6bec6f463d19dfaedb8a25fdb4cbb7430633cd0ea1c20c8a' 
  AND token = 'XrIe0+5DMaNnKlPeH222hq6Nq+nstswKyZGPmR77JCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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