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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6562575ed324ae6df63455ad87152e7ab380ee652278c8a76cef5e58650408' 
  AND token = 'WY+tw3V3ivOxQJWwaWGVIUABjs8I1/df/v/1St59S0w=' 
  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"
    }
  }
}