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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f4e891b9302d07b839af8d75983b567fc6944c4badc264540d48be5064c63e' 
  AND token = 'LLVVwx36rHDs9/AHwhz3FXAbyLBH9c9GNC/Ex7kgt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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