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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e869050a6f8177d272a471f62256a67571ca740d548c25e264af66f9a9c22f' 
  AND token = 'Mc9ui85gZgb1oL7w8nv6kpjneRYAAkaWWQW4nOvfvMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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