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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ebf92403544293b42ebb4baf46d82f997cde05b21ec6bc40244bddae862e6' 
  AND token = 'wXk6G/uwpqExuy6rKfgUtxpWA/mgznFEf6ITeXDjhnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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