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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7733094b01366bc76326e81b7c92fe72bdb91a78ce6c8d099d47f051aa03bf4' 
  AND token = '4FwWy1Jr1eUU+kbviLGyy77P+rzK4Gl05YdHict2iEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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