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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3113e6abfbd50c61f8931e8f51ae50d58e6042a781504aff198039324a4262da' 
  AND token = 'p10/waiqGB/oUr9Yu4PYi8llPfsBR7k4YMTdvAUdR4w=' 
  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"
    }
  }
}