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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c23aee7a6dacf07f7dbb015adb4b1a3a257214fe0abef9dc2dfbee5022ea478' 
  AND token = 'k4pSMq+skMop6DhdBVSbJjEtdUyG37OMAq7VKoXzg+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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