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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd368d87ffd25b31d4be2d3395ec3b1c9e4e269bc444c896a6027adcc1563ea' 
  AND token = '5YhSApOW/84hKEf96gC8U6w0PNi5ws1o9WrCV2klh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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