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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b766b63314ccb2d068bc70272fa21e865a031320ed83dfd92e5088fa0ba8124' 
  AND token = 'aJBiDEiX7Lb4s47ynCkMirlJUA5SFNrf9pbHPqmLJTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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