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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b13ba03bf260c0e14768e3034777e1d6884de86d24fe88527e693283ead4f4' 
  AND token = 'Arg3XPZnGhL+OaTDt/Ggg9Be5zGqfC3IStkE7mst2B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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