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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4acd1653e84185ecad6c0824da9fb8deda0d716fa1cd6e3731b6f286517940b' 
  AND token = 'WdM2LHStYraMRY53buDOhITsHJCjtHQqNepzu57+oOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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