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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bcdd83e982e579af0cae50b57fc5f2cb248df584255233d60dda2009688596' 
  AND token = 'zg3xZr+RqS/u0futk4mi2D20UbzYOvYLAktsocsd5uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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