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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029bd865373aa5e36fdf24885679bc8eab1b147be1ee2804f3258708062fc89e' 
  AND token = 'soWbYPt7/d1qMCINUqes8IXSKT1ebertjd7V1+lDFKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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