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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99b34d892952cbdabea17824699f195bb557dd590ae19ecf8d2f7cf89ac3846' 
  AND token = 'S6cmm/Bm3sYd5ilSww3nMAtB/7VXQ2xyQU+C1EDnQ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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