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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a020d0b3e1cb6db3ec479454ef63a10e2cab32fde93abb6d4547b4e4d1f70c' 
  AND token = 'AaeVYTRFIwp81mOu5cVOb+KOn2EY0lp1uJFO37ObOLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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