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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b077750b51c53866fe9a5b56f392e2167cd27982add71ca9d048b4e9d26821' 
  AND token = 'Zc8brklEXRInKISO3MFd2zza2lt+FuIUvf3U2TTQ8Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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