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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c41cca5124397e9c1164b37ec7d9ac34c8abee750b1685ba008c817a1301fc' 
  AND token = 'R2x0omrI/Vwtttg0VH6w6zZ8KktcCDAeATLr65NPCvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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