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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1828f8ceaf0cc48b90d9cc553e4b3b8e58b06bacb0d2b4621cc7cca009b5c0e9' 
  AND token = 'SHXao6BMoDrX8ujLcYZo47hCiEcu7r4hinlvTGfmsho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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