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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55a614c6c76ad5c8d0b1bbf4020774becc4aef1b0cb39accca54e5f98c4cdae' 
  AND token = 'MVOeNr+yltQXZqQ6fcpapow5oWFkR1C1Uf0lJqy4ATk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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