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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483d98706b1ba20b24be26e093b6bb9dc1b9c04c6d1df5569efb153ccc310c0c' 
  AND token = '3N9s/SOO6JnFSceDA9Kw73viK26Oax3TbA6YTxNbJj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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